SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86767aeb0a98d245d6795d8818b70b514490cb687c60d474d88b865e56863317' 
  AND token = 'pUEhC1wBlQX/3rPM6AgSuMtnkva2EkgdUWw+WwKsABo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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