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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7d1bceecf8011d951b7f94fcdc3669b7a7ed8986a480c133a513aca959c1af' 
  AND token = 'Rhix2gcfnFqZ/DrzYbiVeYhNOiLendIhXpvrOYYxYSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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