SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86cd2a0bf10ec5e6992570f1b587f600216f7a01b57b8a49c349d515520e2df' 
  AND token = 'w2Ps9Nb63FIWIO7scevjXA4PpijAJGA+1DSTyEEKP68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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