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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd826b76a7b1c2933ddb47cde71ec09745ef1f0c79122210ac9c60a30d18a5b60' 
  AND token = 'sy7S7fFyMz4UAvNv85/gClTti3wo6JiCH18YaYoL9PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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