SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432999bf365328aab79b6b42b0bab10fa449b229ba56bf29de799250e5fcdb5f' 
  AND token = 'PfgE8k6NfExh+dmahAKwLNHK+k2HumRtXW5dnAo05/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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