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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977a1ac733aaf7ee188034457ffec0e6e2885dc36424beccbce30cad4e3e8de1' 
  AND token = 'MBBgtw6IXUiIixhvsys/4XmfQt7myohcoBFgJAyzVJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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