SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09761b00977f4591ca3eb973627b0ff307841c763a9af5b9f8743da3f0702726' 
  AND token = 'b9gJ+NNzZ0gboE68PhV6NInXjGUqoHn1v+3J3RlBRCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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