SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdbf45936b7cddb370200c7b0315fac4985a6027c883d116cd15483175ace75' 
  AND token = '4O0/Ga4Zw9fOKztmNUP+Fv0w8d1gsF8wyhro/5nL0U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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