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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ff019a600cb06b391a76507bb6294d76d449f9ded7ffdddc7c02a7cbfaed14' 
  AND token = 'MDB03KLePinZvRWo5hUESKvAd5mlx6XXcjXiApJELRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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