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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1042e39e80aaa131054b61061acf018fd8ecc1acdc477cb14c3388936b85acbc' 
  AND token = 'xunIINIdR5RzHDssrCA+Sv5I4fzOBZSYKxt/EfYNHfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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