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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3057fbd8a4f8583a70b9983347157b7293973afd679c48e0c34791ad3ee34c7' 
  AND token = 'HNFg/lg9ngku7Tv0mdqzoRUY7+7mPnSpgtsPE6au5dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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