SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8ba7eef64d6521e4013a723e4d57ca462b4ce2c7b3d30ecbaaa37060542b1d' 
  AND token = 'IzL6gk+JArXslgWC/b/pCXruelPV9zT93h8B4Vp6ptU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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