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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e080e3eead3371947143bb3d360ae7de5ab28878cfa32ac9c53ed2ef1eaf84' 
  AND token = 'h73yTlVi3NOfIM04MOiNJi/CLg2uS3DZGrd3JZTfl/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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