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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67842fbd8f100f3cc390e8b4563b90ad67268866698475c7ecd630de9ead3c23' 
  AND token = 'IQo7inWCvMMQIBbF7j5xv1NLirs8SBb9/LVFisehHNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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