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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4daa05ca3981b84c4e888a70199edab08f573ad316de45fd23d9b161f9fffb0' 
  AND token = 'K3PXsV1lCkA9KC4evMxw98z4VfKoiKDRgF8mJVOIT7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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