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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a061badf10b4c56c3dcfbfe5e8e89f58dee781fbf85cc8508d4dc5866befbb74' 
  AND token = 'd2l+yU3ppb3+2+cPgNWCSDTsQQSKlalmKpW3QnNj214=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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