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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc088b61b257133062181a183c9a667f227a747134b093ddf916b15d95afbc23' 
  AND token = 'bo8S+S9SPbVk/YgzEPDR+1uO/FHNMWXbCWzwiwlAdrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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