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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbf2e9527bc703ba2530642ace2964be87cddb2a292f92b181ae2e4be5de008' 
  AND token = '9+J6QztUvMnQlkKMYvuliv74zf39/KwShxIOHCSaYrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}