SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7a74da8afb2caba039e2e645ab5c910d1653c1df4aa49b90df6489df54fc50' 
  AND token = 'A575YdApG/e2k+IzuhNOB0vJqUN9Y7zTJ3EElDDL4Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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