SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed99fa84a51b532282a6b8ce71a8c2b5d6b34937406df508a12a3061af3267d' 
  AND token = 'EykrPA/T54TF6xPPgndhvfMFKvc7Cl54MuRK8lk6Tug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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