SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e2ceb05f46fe9eb4534e978d7686754bba3312a78c1849c6069113b67b782a' 
  AND token = 'e3htwlW5Oa2Yy9qcavGGwriGEMZ/SkaXVcZYwNl83AU=' 
  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