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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778419cf77454f23fc9db6da82f7ca44f35e85f85a8bbec667f2c1ec29b17b89' 
  AND token = '4EpgEXYRxwQCsJiCjf9l8M/ohDnE3CYWfjXBYA6b5iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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