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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c58a75b68c5b931f197de1b6f1288ccff9514a005ff6483c5582d0fe6da8bf0' 
  AND token = 'U3hhLP4RQrL8nJtBZg6ddP0hAjTN2oRP0nkiiCv7J/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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