SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b564e3ba34973b9fb94b8a1a52f992b4772029b234039304e79f4b78b0ef2b' 
  AND token = 'JV1j2VIqlCQQt/0jNNuvFucOqA8E01lheUO9UgIdUL4=' 
  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