SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29451071789b43d64dd2281068110182e5524a453c5b7f313933bb652f30d03' 
  AND token = '0hizAzS+0dOimP2hl9mNSwnpPCBlTr2CW6205THdtq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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