SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ff979b5d95981ccfc0dc047c7414d4e8c0bb1626ecfbd7279a5a1d02c63962' 
  AND token = 'hXzxX5G2u9GPM2VcsV5WUojQlYR1oczdmsUXc4G/Lmw=' 
  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