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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6351f0e5a55323b361da83e0d20f4553ba11059065dc7170ecc32a84735a0cb' 
  AND token = 'TW8+WNP1apOk1QSW351cqbv+dYrmBlV1RXnAn/6F/Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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