SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cdf53a98a903479df0c98191439d858e24c0ddb7c109d98317dcfda9ae08119' 
  AND token = 'EUT954YF24JO1CPjrMiFyvGAsAZ21g/QWF0Juj01Ado=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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