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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f41fedb830db9b12dc1d74d28eba6e9bbf344356d6eeaa5c6660fb9855189c' 
  AND token = 'FSdoDNxN3saxy+/f62cHOC4afKSIEpiYR5rPKvQNoXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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