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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfbf19906bbcdb2bded8ad5c2f22324c77ca37ba44ea719c4a7a884ce9522e3' 
  AND token = '24QcacE/jhUbsLo6qrq7gqQjVxWCb/a4cFs7KDQc3J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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