SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d8b27e4e678c6c04606686c636ecc774d7897b60f0850cf7bcb52743746019' 
  AND token = '/vxDevH0qOUaCWgKyaBZ4X2v4cg9e+XwCitj50MyHvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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