SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c769056897c7b6853167d04524bc99f3f7a939940db5c8d1ad167c0c2083b641' 
  AND token = 'NCxprSdJC+wczQ1hGlyeo7HwlPpk8tS5GqzlApilHN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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