SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c9ec0545b57c657fc20a3b2594f853033e87e11062fa17ff2c1e4a2684a3ee' 
  AND token = 'G4ctdO29dPZmCHk+ekxYFolLr8cm+GmsGzP58epm6oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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