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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65692c8df49000997226faac2f7aa0824853b07a86a0995d6546e211b6871663' 
  AND token = '2jez0n7zJr0PQDh40IvEzFyXg33JsHjXCHwnz9eVT1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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