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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e8251450a786180d161061bb2a6c4d3fe3ba01b3e97e8282e1c0ced7fed3b1' 
  AND token = 'FwRzHaKXTc97uWzHczqE8VPvNEv0ZT8GE+o7hWQpEIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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