SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daab3bbfc2690d3e6cc8ab627dd21aee4d361fbd24f43caf42d5def093acdfd0' 
  AND token = 'Cd9AZ2QzJBlWj/f54L6OWdDSt03rz7gzZFmuiNR1eRw=' 
  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