SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e30162c828a952e657ade2801f26c630e2131353713929a235f2d08dba18e0' 
  AND token = '+cM3mwalAYBm8wCnNsg1IY5r8c+H/GefHgkhu7QyHaI=' 
  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