SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f95059ebd11724a8aeaf4d89f7bfaf926625fe070274b269d4e90dfd6f03389' 
  AND token = 'iNz0SSHOcBBave3mXj4fStls6Pgua3HQccG/ipzBCi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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