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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b283c07cb5bf83400d7d80fc401c7c750becb045fd8216d55c65380642acdc' 
  AND token = 'eu9o5BjyffwyyhHGU6WEmB9UKG5/bTcl24Y6GQGyg3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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