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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '279904d6c3d921e998c5a6d3b6f4b0aa7a8a948b0f3d3e008a994584398f9c63' 
  AND token = 'dt1eKba7LfeMOhMhk8AGx8z8G/mmO/fcBjLNaQzf6Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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