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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bce43ff5cc28ee7d7dda2d91ee56a0b7706012c6e8acc49812eb45cc8ae58b' 
  AND token = '5nSbFKiSUlJMKvFFclWbg6Stdqg8O2aCuTEU0JiQ5Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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