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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24377d33d7e846c3c9cc673788eb75c4efea754271e6eee0fe42b04a58878691' 
  AND token = 'ktc/BsW989UExYkFJJ/KNJ2Bf6Qb9lJAR2h1tOzZP/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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