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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1124b675b0821e3b6b45ecb7b05af80b96a4bcbb5c6a92b4e8e77c98fefba7' 
  AND token = 'oSn6fJvdgJOeKvA4EliR8vAQTcyYBUr9o5v8mO4tV3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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