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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2b600f610f1daf61ba3a5dac08cf27ae578c022cc9f5f14c88a6e5a9fcb7dd' 
  AND token = 'GYQ2mAbTpkPlgK5xN3motP6U9Mc5XY8qlR83axZZ7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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