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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cc9155672946eb0743036792bbd1b6e99c9c573f435c9b5565ef18cc4095f3' 
  AND token = 'c7iobDAQ8l+0v5ieDt6mMX+Veer9QH1vrvJi1lEKpAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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