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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d38b6f95681a6f8496a34f8cae86665a94192f4b627a1edfa2774ad8accd173' 
  AND token = 'oSzgAhnwCIw9Cx5Q0l24i6vng+Sxsxh0kfUrQcYk7uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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