SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb1e7885d522320df28ee3952cd84d8cfaaaf912b4bccbc1450208523b040f5' 
  AND token = 'JpmG5bsX/P1XRrDMRD4dZwNGCFe1D9XC3M2ioGgJ0Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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