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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f00ef038a62cf4c9333ad83790466e6d1009732d6002c43f3f858f76377c836' 
  AND token = 'wBHwxmBvPC31JvHJtuperzN3Xse6aRI8dlKI9Vxb8n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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