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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda8de0c5b2c4785ea7e5b449f3d0cf5c589c379e772de6775ac47ba1bef8248' 
  AND token = 'j5HMdZgX2RUSwqPy0tzXQCoeLekesxK0m0778eLq8Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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