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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b96d97554996d614202a09680b99faa7d190197d125fea5ecada333df2c9ee' 
  AND token = '5Vfqdelf6KBaIHY/fCbMMGU6d4Pz/ADwxTJ1QmmEu2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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