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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde6cabba6fa7e2d1db40502a21ec342118b17caa14f99bd420c6e2a6e6c9e7b' 
  AND token = 'AIETQkyfHc3TRL/te8HM1T/IEkTqjLzoMzoIJkb/XjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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