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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e940afdae867f6ef3b956b3d6af06166b4a9ae62e5df2d1eea6d4bdd3d678f0c' 
  AND token = 'nyH3fsFC61GGuLQCKN4D2CmLXjQuIudYYOkZlGZ8LzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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