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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9edc788952131f8d7858c79f60136f21796c1b12612a873fad3bbdeebf95776' 
  AND token = 'olQpO36rY2IRXrAGJtofrYwNCUQG9YE1koU/Lp3rS+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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