SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65510cc2385ef07f3aa164e6c571c9d34fbbcb1e9edfe085ba066de54baa3838' 
  AND token = 'FRojmta8li15rWuq9EL0R4Vp0mcZmOHq/wxXDqi1fJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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