SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c6b5ce8331393f480869327d63843807a4a635b4ec22eae01d5a8b729a0a16' 
  AND token = 'ux6XS3M1rvHIETVxviBdn9ApXcWMeD9kmHyLpVOFHCg=' 
  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