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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3debd62a951df4d1e7ac0ddb6a3986b315c1a9f103c2eb29de8c5bf08494f42d' 
  AND token = 'eiqglHRQK46a3UWFO66N9u5JK3rTZVX9x8BF/e/YjFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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