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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ce9db1a13e29d3dfe861ca7a6378e8b4ec6a84a7a15a93ffe8288f3365a696' 
  AND token = 'Pdt97UJrMHeJg1WD6JiUCUt47BTFxknuzKNaFOVU5aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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