SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbf29d61b96daffd6a800edff615d69d6ea00585c67b580f458623d12829d95' 
  AND token = 'aSPU2DpKPq5kO39dw4aJAZfdJis+szw84EY/oQkZXrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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