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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818f2e0deb4ca61595c2c5140b7dea2aa4cb1736d4997027f62d2ac313aaae21' 
  AND token = 'v/L8vRGIYfzl9BSOJX1heW/5zJD8Il2Bo9WsLDpof5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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