SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864fac9547092ef310e2591a9ac0e72489eca59cab7a4574467bff8027da36a8' 
  AND token = 'ReXiPWSeQ6Pmr1qvAv6lw5xgcLD8OQx9CDiCPUzGXX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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