SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1662c4637b453fb51eb60f71470f064841d78ea9b4b1db9503d6375f73b3a5f3' 
  AND token = 'WkOAw5ehCYzLudHCNSdpLQ+D/C6R1MlCPJ2eFoCI0bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

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