SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862274989a290b0b314f129b12fcd15a9c0ffc3201a0bdf95f180f574a3bead9' 
  AND token = '/VSCnMdSOeWf0dHRBUR//A7JVmzqIE2FGGjciPfPy94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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