SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693719eebcc394fee2574d34f2e8fc6a66a1e6eda1affa8b5c34117150009b48' 
  AND token = 'T09eqEqkNW90aB7PaemNlZkoR+g0Db4gN1OdLsnATg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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