SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c93b2f7add9565075c37cfd0305675a3aeac3f0ef9f7329eaea97b7f078a695' 
  AND token = '8FADr5A7up5gn1D2/gBLgKr0AHJKrmYztTNEigXMFxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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