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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc0d5255e9fd0e5fbfa9b3a3c3046f058abc9b5459e272c239da0f540ab9a15' 
  AND token = 'aSl7t3oi5+fLMzjGXnOnEqDLeO9qE9DN1QtuVZVIBhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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