SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da74fd82b28d16fa6f2e4c8afc030a64b0efb2d85218afc93738ecc0a281f16' 
  AND token = 'zG/ULea3p/efRR+dvkoh1WF7YiUTd4FaqycXxJK8m9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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