SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a358ab55af6e3beb0770b79568564e3d54706e4342f6b7fd7fac1292051faeff' 
  AND token = 'h1IIRtMcGDCErNWr+Mvrf62e0Z3ina14hFKySX8abeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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