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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8704000f8bff804277596f11fd7bfe0bea45ebcd145fde3dd76c30cad0263dda' 
  AND token = 'bygy3s0nIucDpnVtmCya/yBs5pK/HU4ER7qRxZw2my4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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