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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae3c6cb02b01c57c1310e5f8e03961bdae534c59563f8fc37105d9e43260f2e' 
  AND token = 'Oz/81iny92gdaCyUJ5PrxvaBdzcHi5Ho7pY0X3O80G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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