SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429a930d5cad55d9d06dc48721ab3a49a0232c95a3a901a4388d30a47d0af88f' 
  AND token = '7qhj/QBhh0O8z7wI4FGiFpgdsoMWb3padLiHvz60xH4=' 
  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