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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cd87fcd6f9f15b1e0d1e01598356161f5805b5c77f4f095e45e6122cc89615' 
  AND token = '2FOnlg7VW6+cyaDuKEt73LvMhlauAOgh6+7rjaF1g4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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