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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46083825c3044fdcdd51709a91c7e00590bb8be34edec9a38d9596ed1afacea4' 
  AND token = '1oICuiY1kPgbFZM4UYlAd0i1DlGFijnbOUiO4bsQZyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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