SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0be25d76498e7877201e4183eedf24e07fac3eadeba4439f326935dade80fa9' 
  AND token = '9lEg9q4aTSvXjB0+MJgfw5BoVzn008cjvy8Be7pOqk4=' 
  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