SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319fd312db9a60c95c5338ed653f704ffe2207d508d98a474b0c88f1086eff56' 
  AND token = 'hUuD2jBRQ07kMDuC4kEXZXIc8AA3oxYb+sXUubNvtIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables