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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8230cbd1b5a9beb1d0e885a1fe155d063f6b23a4c85725e42d8d953987fe8d96' 
  AND token = '7h4WC1amStfVo5xb5LECy+ZXwO8b/nU+osoFg+mkHqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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