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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77e05fdd0ea62396891f8ca99734970cc15065790de056df92171d689e97f02' 
  AND token = 'D0H5HvT7XGn7TlFd8UJ8Lr5+EPxkM8l//Gyz6r6a9ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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