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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c87cf0bdeff30c7e5c72aa07f5426503b411cef08d7e93b8d5e0fc1cc9d130d' 
  AND token = 'xE6Z2J4DlsGoWA8GpZ6z0x46EfCRoNzUY9qIkYHU4Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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