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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913308c0b287377760a5dd4f72af370b35bd4de97e638d5f8206b255a18c93aa' 
  AND token = '8Z1Dg4oy7jQfyAFa2jQE0XDbE14RTMO7VygWL9g+nQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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