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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c89e3234859c8de8a40fe07c344d734d62a247d5d8993f32d80cb5b53c3442' 
  AND token = 'yNIy0k1xtneJNhS2a2Ia0P0UOm2iF8rgorZD8ycwFPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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