SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9f66bb56a7d16de546ab155727fb2694730af1bbcb8364fddc94ab134ca8a9' 
  AND token = 'Q8UEKa1xwc/S3m39GITNxlFtH1f55t5iCmijFdSrM7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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