SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e56f5be8d148b6c77043bad2636492cbe7de7677961e7e63084f38b57c47bf' 
  AND token = '4DV9M1nacdA974Kl+v2AfLZmfh+W5yIwY2FnS/z3K1E=' 
  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