SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a475b8aae0ef855ccdee64b19b3ad3752d97fd6b3bf0ce12ecba623f2cdd1ef6' 
  AND token = 'bEejn6qmmkdglGt+emNZPKGnWIfdhXc3JSKXPDqmSVw=' 
  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