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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d242738bb6556df2ec777bf33e6c90c963146f2eca26f972d83cc43b3dc1a6' 
  AND token = 'MkZHOV2DcImZSwAbaEfKY7prXLat0r8j8Wm/S/3MHDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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