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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82b2008f440a12e0c9fb11e00739107425f195473090d9193fcaf9cca128bc9' 
  AND token = 'BDJ6oCT832nY0h8CQk3IvSH3xJwFM2UbEoKZE6ya2lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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