SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e868a8143b29d73e553238fe4dc6f28eef39983993815835384a6991702b6c' 
  AND token = '/1iKcqfrhyZD0pflXH+I8KM3R5vz4UfnGsa+jr5D6+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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