SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1b4139cb2b80fa1327bf77e4e89c30cf8bee6675ef69b1b2f406425e844ddb' 
  AND token = 'j23TM5xeCgJmkkejEQx6Nzu7o0ISGLJOb/jubcgFPsM=' 
  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