SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd4ece5018fa3a31f2ae7396533f07fa87ecec0fcb5141b0999827c568dd189' 
  AND token = 'xAR8BtLTjtDLmXNBfAtAN+d0peh4Y/fv2oZPED8lqMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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