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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea471b5cfd3c6a7c7b516ef3096431f76e1ec55d128f63b564afe081681ba3f' 
  AND token = 'yD4BAzrNnQtuLf95ymtU6WDTTfU7M84OnE4YX3LI6+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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