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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df18dac19234fb8c7da055d1fa22c2592e5e6502d0eabd6b88be82447574920' 
  AND token = 'kE0SLbwSOAx3Tg6nL/G57040Fyy6HuoeM1Ts2hBWwEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}