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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee284cbf4a4a4e742fe613e077108ed2fccb430dde9a6935da392f302426d22' 
  AND token = 'Z7plz/WGQLHNwdCHJjq8AkUFwyU4aZLxC8q47ho3kJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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