SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d1e63bd71e0ab2b12e7830026fa40379bd2fe4e401f4f8dcb377ff47b806d3' 
  AND token = 'sedMyyC3KmVuSu62xMzYgU46Qz5+wJJURYzmNv4S1JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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