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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e713f8b397dafdf4f3d5205c28d578dc0fd4cd67b5cb1123ff9dfefb1377cb4d' 
  AND token = 'vO9OQ0hAER6t5je7TxRXyIjSPx+z8863iRL0jsHvRq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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