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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a910b8b5fceea04119ba3097d24e4ef65142b971ec2b4c0566b6a762ec1fd795' 
  AND token = 'e3oby3M3U9hg12IqiS5JZ6famv5Enryw7Km2AxvpOJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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