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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcd3aac029719a812269e5962c1b3c1ec2175bbb67295e114325d418aa48c6a' 
  AND token = 'YgURVd2wS8LPSpXciqy/cXvch3j5/0wv72kctxw1F0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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