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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af46730e68f4dee02a7f949a151e6c7e1a37c72f71e93e9ae66c7b83416e9ab9' 
  AND token = 'OB47AtWiX1LM5P3RLi1wQyGpFlW53F45+0tcs8UYqQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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