SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b0aaf04371530b776c252a6801d490cda33a66d7610576cf6135bb1cbebf4d' 
  AND token = 'Mq2CmUzj/TzI0mK+EwYvnUMAQfdoGtoynw3a4vG9DBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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