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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ee741391de4df62aef5f6583eda51c9d7b558835f61f30d707c88622332ae9' 
  AND token = 'pXZEawXd7d3WZzw5v/WEODRfFYj0WuMnRCf5dQNYg5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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