SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b21f9e126a8ad4edb6375a1113ff079df42cdd9d382c80c5a45b9a5cf8735f0' 
  AND token = 'BA1Cjew+fbGiIjx4pwZthNU2/7lfNomzilL3dJzrVwE=' 
  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