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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f7f9903db75d6e7f12393bbca04e6638a67c7f0e0e398c57b9965c54f14d6f' 
  AND token = '3S/u3ljKDOhV3wKskbLe5pk2GXChPwKB7Q1f/iQrfAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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