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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b485d89058dd9c90bc178598dd47437eab05b8621bfc7de344015931f31231' 
  AND token = 'WPLSrGawxqoO8cTbAWCOC8I7EaxififpSqKGauAObGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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