SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbc1b30acfadf326398e47719b1c5973e5f0108579bfd116c13a802adcf5fc0' 
  AND token = '7lfDsYLvYDbHX3i47ksbsEU1B/NuxktwSLHJrS0DVTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

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