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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fee9700445ee57833f4e8be2403a3cade0808ba75f081775da3ef63e231becd' 
  AND token = 'TB+I1jXd4wxUWxg7N/BhUmV33+cwSjSpeTWbr8Avpt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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