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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d7fac511b539012107eb3e8f49ae8decd39847a2a3d2191e368ab574724a0f' 
  AND token = 'jCcv6N56T+6dBk6sK0yePpsKDCC8bqRGahq/Zrl4Eb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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