SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f99089593f80adcb5fd8f11d9ae39827a4d637ca7f3a27aad13d6cac8ad106' 
  AND token = '7m1bIH/hetncoCuUPE3Kk3sSiyyMkk+auUeT25ysC5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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